In the 4x12-ft cab of the 1136 to Virar, motorman Rakesh Saxena has a battleworthy array of cranks, levers, gears, gauges, wheels, alarms and switches within arm&rsquos reach. The gizmos tell the 59-year-old veteran driver whether all passengers have boarded or not, whether the rail ahead is fractured, or whether a level crossing may be open about any obstacle on the lines, an electric supply glitch in any motor coach, and the status of a signal he has sent to the command center. But none of these devices is quite as indispensable as the two &lsquohooter valves&rsquo&mdashmetal pedals&mdashat his feet.